后置摄像头无法正常工作-如何解决？

Question

我正在创建一个相机应用程序，目前我正在其中通过捕捉快照并将其发布到ImageView中来测试设备相机是否正常工作。 问题是当我使用前置摄像头时，它工作正常，但似乎不适用于后置摄像头。代码是：

//代码以获取快照：

private void dispatchTakePictureIntent() {
    //Toast.makeText(this, "Button Just Clicked", Toast.LENGTH_SHORT).show();
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File
        }
        Log.d("Camera Exists", "True");
        // Continue only if the File was successfully created
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this,
                    "com.example.android.fileprovider",
                    photoFile);
            Log.d("Uri Exists", "True");
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, 1);
            Toast.makeText(this, mCurrentPhotoPath, Toast.LENGTH_SHORT).show();
        }
    }
}

    private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );
        // Save a file: path for use with ACTION_VIEW intents
        mCurrentPhotoPath = image.getAbsolutePath();
        return image;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // Check which request we're responding to
        if (requestCode == 1) {
            // Make sure the request was successful
            if (resultCode == RESULT_OK) {
                Intent intent = new Intent(MainActivity.this, DisplayActivity.class);
                intent.putExtra("key", mCurrentPhotoPath);
                MainActivity.this.startActivity(intent);
            }
        }
    }

//代码以在imageview中显示图像：

Intent intent = getIntent();
        String value = intent.getStringExtra("key");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_display);
        imageView = findViewById(R.id.image);
        File imgFile = new File(value);
        imageView.setImageURI(Uri.fromFile(imgFile));

正如我提到的，当我使用前置摄像头时，imageview包含快照，而当我使用后置摄像头时则不包含快照。